Merge remote-tracking branch 'jixiuf/scrollback-support'

1 files changed, 40 insertions, 6 deletions

diff --git a/vterm-module.h b/vterm-module.h
index b9dcd8d..775b59d 100644
--- a/vterm-module.h
+++ b/vterm-module.h
@@ -7,11 +7,45 @@
 #include <vterm.h>
 
 int plugin_is_GPL_compatible;
+typedef struct {
+  size_t cols;
+  VTermScreenCell cells[];
+} ScrollbackLine;
 
-struct Term {
+#define SB_MAX 100000  // Maximum 'scrollback' value.
+static bool refresh_pending = false;
+
+#ifndef MIN
+# define MIN(X, Y) ((X) < (Y) ? (X) : (Y))
+#endif
+#ifndef MAX
+# define MAX(X, Y) ((X) > (Y) ? (X) : (Y))
+#endif
+
+
+struct term {
   VTerm *vt;
+  VTermScreen *vts;
+  // buffer used to:
+  //  - convert VTermScreen cell arrays into utf8 strings
+  //  - receive data from libvterm as a result of key presses.
+  char textbuf[0x1fff];
+  ScrollbackLine **sb_buffer;       // Scrollback buffer storage for libvterm
+  size_t sb_current;                // number of rows pushed to sb_buffer
+  size_t sb_size;                   // sb_buffer size
+  // "virtual index" that points to the first sb_buffer row that we need to
+  // push to the terminal buffer when refreshing the scrollback. When negative,
+  // it actually points to entries that are no longer in sb_buffer (because the
+  // window height has increased) and must be deleted from the terminal buffer
+  int sb_pending;
+
+
+  int invalid_start, invalid_end;   // invalid rows in libvterm screen
+
 };
 
+
+typedef struct term Term;
 // Faces
 emacs_value Qterm;
 emacs_value Qterm_color_black;
@@ -30,12 +64,12 @@ static emacs_value render_text(emacs_env *env, char *string, int len,
 
 static int set_term_prop_cb(VTermProp prop, VTermValue *val, void *user_data);
 
-static void term_redraw(struct Term *term, emacs_env *env);
-static void term_setup_colors(struct Term *term, emacs_env *env);
-static void term_flush_output(struct Term *term, emacs_env *env);
-static void term_process_key(struct Term *term, unsigned char *key, size_t len,
+static void term_redraw(Term *term, emacs_env *env);
+static void term_setup_colors(Term *term, emacs_env *env);
+static void term_flush_output(Term *term, emacs_env *env);
+static void term_process_key(Term *term, unsigned char *key, size_t len,
                              VTermModifier modifier);
-static void term_put_caret(struct Term *term, emacs_env *env, int row, int col,
+static void term_put_caret(Term *term, emacs_env *env, int row, int col,
                            int offset);
 static void term_finalize(void *object);